<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>用于字符串的+运算符</title>
	<script>
		txt1="What a very";
		txt2="nice day";
		txt3= txt1 + txt2;

	</script>
</head>
<body>
	
</body>
</html>